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DeShong's original conditions are: 30 equivalents of vinylene carbonate, 95 °C, 72 h (see ref 20). It is noteworthy that use of five equivalents of the carbonate (condition used in this study) allows for a less cumbersome isolation of the cycloadduct.
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0343801316
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Reaction through the alternative conformer is predicted not to be competitive; this conformer suffers from steric and electron-electron repulsion, as illustrated below Chemical equations presented.
-
, vol.32
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